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Preferred Shares - Issued and Outstanding (Details) - CAD ($) shares in Thousands, $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 17, 2016
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Preferred Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 38,600 | 38,600 |
Number of shares issued and outstanding | 38,600 | 38,600 |
Issued capital (Note 25) | $ 942 | $ 942 |
Series A |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 10,200 | 10,200 | 12,000
Number of shares issued and outstanding | 10,200 | 10,200 |
Issued capital (Note 25) | $ 248 | $ 248 |
Series B |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 1,800 | 1,800 |
Number of shares issued and outstanding | 1,800 | 1,800 |
Issued capital (Note 25) | $ 45 | $ 45 |
Series C |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 11,000 | 11,000 |
Number of shares issued and outstanding | 11,000 | 11,000 |
Issued capital (Note 25) | $ 269 | $ 269 |
Series E |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 9,000 | 9,000 |
Number of shares issued and outstanding | 9,000 | 9,000 |
Issued capital (Note 25) | $ 219 | $ 219 |
Series G |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 6,600 | 6,600 |
Number of shares issued and outstanding | 6,600 | 6,600 |
Issued capital (Note 25) | $ 161 | $ 161 |

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